Lifting-jack



J. J. MiZER AND V. JAKQB.

LlFTlNG JACK APPLiCATiON FILED SEPT. 5.1919,

1,345,797. nt d July 6, 1920.

3 SHEETS-SHEET 1. MIZER AND V. JAKOB.

LEFTING JAEK.

APPLICATION FILED SEPT-5.1919.

Patented July 6, 1920.

I I I II III III I fli IllfI W 1 \II 0 W L J. MIZER AND V. JAKOB.

LlFTING JACK.

APPucATmN FILED SEPT. 5. 919.

Patented July 6, 1920,

3 SHEETS-"SHEET 3- UNITED STATES PATENT OFFICE.

JOSEPH J. MIZER AND VICTOR JAKOB, OF RACINE, WISCONSIN, ASSIGNORS TO WALKER MANUFACTURING COMPANY, OF RACINE, WISCONSIN, A CORPO- RATION OF WISCONSIN.

LIFTING-JAGK.

Specification of Letters Patent.

Patented July 6, 1920.

To all whom. it may concern:

li it known that we, Josm-H J. Mlznn, a citizen of the l'nited States, and VIcToR .lanon, a citizen of (irermany, residin at llacine, in the county of Racine and btate of Wisconsin, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

()ur invention relates to a lifting jack and more particularly to a jack in which the lifting member is guided therein and moved upward or downward by mechanism including a gear arrangement associated with the operating member of the jack; and one of the objects of the invention is to provide in such a jack a handle associated with and adapted to have relative movement with respect to the operating member and means controlled by said relative movement of the handle to determine whether said mechanism shall raise or lower the lifting member.

Another object of our invention is to provide a jack of this type which will be strong, compact and of simplified construction.

The invention consists of the novel and improved constructions, arrangements and devices to be hereinafter described and claimed for carrying out the above stated objects and such other incidental objects as will appear from the following description.

The invention is illustrated in a certain preferred embodiment in the accompanying drawings, wherein- Figure 1 is a side elevational view of a jackembodying the principles of our invention;

Fig. 2 is an enlarged sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a transverse sectional view taken on the line 33 of Fig. 2;

Fig. 4 is a vertical sectional view of the jack taken on the line 4-4 of Fig. 2;

Fig. 5 is a transverse sectional view taken on the line 5-5 of Fig. 4;

Fig. 6 is a plan view of a preferred form of handle for the jack;

Fig. 7 is a longitudinal sectional view taken on the line 77 of Fig. 6, and

Fig. 8 is a transverse sectional view taken on the line 8-8 of Fig. 7.

Like characters of reference designate like parts in the several views.

The jack comprises a tubular standard 10 and a lifting member 11 which may be moved up and down in the standard. The lifting member is provided with screw threads substantially its entire length and is prevented from turning in the standard by means, for example, of a pin 12 which may be driven through a suitable slot formed in the lower end thereof, the projecting ends of the pin 12 sliding up and down in the vertical grooves or channels 13 formed in the standard. The upper end of the lifting member is reduced in'diameter to form a shoulder 14 which supports a rotatable cap 15. A recess 16 is formed in the top of the standard to provide space for a miter gear 17 which is provided with internal screw threads adapted to engage the threads formed on the lifting member 11, this gear being provided with a neck portion 18 which fits loosely in the aperture 19 formed in the top of the standard. The bottom of the recess 16 forms a bearing 20 for the race 21 which supports the balls 22 held in position by means of a suitable retainer ring 23, another race 21 being interposed between the balls and the bottom of the gear 17.

Operation of the miter gear 17 thereby raising or lowering the lifting member 11 is effected preferably by means of two bevel gears 24 and 25 which are supported on opposite sides of the standard on studs 26 each of which is formed with a threaded portion adapted to engage the internal threads of the recess 27 formed in the standard. The studs 26 serve as pivot supports for the arms 27 formed integrally with the handle socket 28 which socket serves as a frame or housing for the reversing mechanism.

The socket 28 is provided with a rectangular chamber 29 which is parallel with the axis of the gears 24 and 25 and is formed with an aperture 30 through which the gears 31, 32 and 33 may be inserted and arranged as shown in Fig. 3. The socket 28 is also formed with the recesses 34 and 35 adapted to receive the locking dogs 36 and 37 respectively which are pressed into engagement with the teeth of the side gears 24 and 25 by means of springs 38. The outer end (If. each locking dog is beveled oil at 39.

opposite sides of each locking dog a groove 40 parallel with the axis of the dog is provided. The gears 31 and 32 are each formed with a perforation 40 adapted to receive one of the locking dogs, the projections 41 of the gears extending into the grooves 40 of the locking dog so that the gear turns only with the locking dog on which it is mounted. The reversing gear 33 is rigidly secured to the inner end of a sleeve 42 by means of a rivet 43 this sleeve being loosely mounted in the socket 28 and proi'ided at its outer end with a collar 44 rigidly secured to it by means of a rivet 45 to prevent longitudinal movement. The collar 44 is provided with two oppositely disposed recesses 46 which are adapted to receive the outer end of a spring pressed plunger 47 mounted in a recess 48 formed in the socket member 28.

In assembling the reversing mechanism the gears 31 and 32 are turned so that the beveled surface 39 of one locking dog will be disposed oppositely to the beveled surface of the other locking dog, the reversing pinion 33 is then inserted between the gears 31 and 32, as shown in Fig. 3. The indentations 46 of the collar 44 are positioned so that one of them will be opposite the plum ger 47 when the locking dogs are in the position shown in Fig. 2 and the other will be opposite the plunger when the locking dogs are reversed.

A jointed handle is referably provided with which to operate the jack, such a handle being illustrated in Figs. 6 to 8 inclusive of'the drawings. The handle comprises the pipe sections 49 and 50; the outer end of the section 50 being provided with a gripping member 51,1;igidly secured thereto. Since the connection between the sleeve 42 and the section 49 is similar to that between the sections 49 and 50"it will suffice to describe but one of them. One end of a plug 52 is inserted within the section 50 am secured in lace by means of the rivets 53, the other end of the plug being adapted to be inserted in the outer end of the section 49.

.The rivets 53 serve also to secure one end of a leaf spring 54 to the section 50, the other end of the leaf spring is formed with a hook portion 55 which is adapted to snap into a recess or perforation 56 formed in the section 49 when the two sections are placed in alinement andforced together.

Preferably the side gears are incased by means of covers '57 which are stamped out of sheet metal and held in osition by the arms 27 of the socket mem r 28 and the screws 58 (see Fig. 4) which pass through perforations in the flanges 59 into suitable recesses formed in the socket member.

Operation: When the locking dogs are in the positions shown in Figs. 2 and 4 and the handle is moved downwardly the dog 36 engages a tooth on the gear 24 and this gear is rotated in the direction indicated by the arrow on Fig. 4, the gear 25 being indirectly caused to turn oppositely to gear 24and since the beveled surface on the dog 37 is in the path of the teeth of this gear this dog slides over the teeth. hen the handle is moved upwardly this operation is reversed, that is to say, the dog 37 engages a tooth on the gear 25 and forces it to rotate in the same direction as before, the dog 36 now sliding over the teeth of the gear 24. Thus it will be seen that the gear 17 is caused to rotate continuously in a direction to lower the lifting member, the side gears 24 and 25 acting together successively when the bandle is moved upwardly and downwardly, first one dog actuating its associated gear and then the other dog actuating its gear, the dog that is idle for the moment sliding over the teeth of its gear until the direction of the handle reversed.

\Vhen it is desired to raise the lifting member the handle is turned half over, the locking plunger 47 now engaging the other indentation 46. Referring now to Fig. 3 it will be seen that the gears 31, 32, and 33 are equal in size. Vhen the handle is turned half over the gear 33 is rotated 180 which in turn causes the gears 31 and 32 also to rotate 180 resulting in the position of the locking dogs being reversed from that shown in Fig. 2. That is to say, the dog 36 will then only engage the gear 24 positively when the handle is raised and the do 37 its associated gear when it is lowere Reversing the position of the dogs in this manner causes the side gears and the top gear 17 to rotate oppositely from that first described so that the lifting member is raised instead of being lowered. \Vhen the gear 33 is turned only 90 the dogs are rotated so that both side gears are locked and conse uently the lifting member also is prevente from moving.

The ball bearing interposed between the gear 17 and the standard reduces friction to a minimum. \Vhen a handle of several sections is employed a powerful leverage is ob tained so that very little effort is required to operate the jack. A long handle also makes it possible to place the jack under the axle without inconvenience. This is desirable especially when lifting the rear axle and the automobile is equipped with a gasolene tank in the rear.

While we have described our invention in a certain preferred embodiment as applied to a double acting jack, it will be understood that modifications might be made without departure from the principles of the invention. Therefore we do not wish to be understood as limiting the invention to the precise arrangements, constructions and devices shownand described except only so far as certain of the claims herein are specifically so limited.

"e claim: 1. A lifting ack comprising a standard,

a lifting member slidably-niounted therein,

an actuating gear seatei'l'; in said standard and having threaded engagement with said lifting member, gears rotatably mounted on opposite sides of said standard and meshing with said 'actuating gear. an operating handle pivotally connected to said standard and having means adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to rotate in one direction, reversing mechanism associated with and operated from the end of said handle whereby said means acting through said side gears may be positioned so as to rotate said actuating gear in the opposite dire: tion.

2. A lifting jack comprising a standard, a lifting member slidably mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatably mounted on opposite sides of said standard and meshing with said actuating gear. an operating handle pivotally connected to said standard and having means adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to rotate in one direction, reversing mechanism associated with and operated by said handle whereby said means acting through said side gears may be positioned so as to rotate'said actuating gear in the o )posite direction.

3. I lifting jack comprising a standard, a lifting member slidably mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member. gears rotatably mounted on opposite sides of said standard and meshing with said actuating gear; an operating handle pivotally connected to said standard and having means adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to rotate in one direction, reversing mechanism associated with and operated by said handle whereby said means acting through said side gears may be positioned by turning said handle so that said actuating gear will be driven in the opposite direction.

4. A" lifting jack com )rising at standard, a lifting member slidabl mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatabl mounted on opposite sides of said standnr and meshing with said actuating gear, an operating handle pivotally connected to said standard, said handle having two locking dogs adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to be rotated in one direction, and means associated with and operated by said handle adapted to reverse the positions of said dogs whereby said actuating gear is caused to rotate in the opposite direction.

A lifting jack comprising a standard, a lifting member slidably mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatably mounted' iih opposite sides of said standard and meshing with said actuating gear, an operating handle pivotally connected to said standard, said handle having two locking dogs adapted to alternately and operatively en age the gears mounted on the sides of said standard to cause said actuating gear to be rotated in one direction, and means associated with said handle adapted to reverse the po sitions of said dogs when the handle is turned whereby said actuatin gear is caused to rotate in the opposite irection.

6. A lifting jack comprising a standard, a lifting member slidabl mounted therein, an actuating gear seater in said standard and having threaded engagement with said lifting member, gears rotatably mounted on opposite sides ofsaid standard and meshing with said actuating gear. an operating handle pivotally connected to said standard, said handle having two spring pressed locking dogs adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause the actuating gear to rotate in one direction, a gear mounted on each dog, a gear mounted in and rotated by said handle and meshing with the gears on said dogs whereby the positions of said dogs may be reversed by turning said handle thereby causing said actuating gear to rotate in the opposite direction.

7. A lifting jack comprising a standard, a lifting member slidably mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatably mounted on opposite sides of said standard and meshing with said actuating gear, a socket member pivotally connected to said ,standard and having two locking dogs adapted to alternately and operatively on age the gears mounted on the sides of sai standard to cause said actuating gear to rotate in one direction, a gear mounted on each dog, an operating handle rotatably mounted in said socket and havin a gear secured thereto which meshes wit the gears on said do whereby, the positions 0 said do s may reversed by turning said hand e thereby causing said actuating gear to rotate in the opposite direction.

8. A lifting jack comprising a standard, a :lifting member slidablv mounted therein, an actuating gear seated in said standardand having threaded engagement with said lifting member, "ears rotatably mounted on opposite sides of said standard and meshing with said actuatin gear, a socket member pivotally connected to said standard and having two locking dogs adapted to alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to rotate in one direction, each dog acting also as a shaft and having a gear mounted thereon, an operating handle rotatably mounted in said socket and having a gear secured thereto which meshes with the gears on said dogs whereby the positions of said dogs may be reversed by turning said handle thereby causing said actuating gear to rotate in the opposite direction.

5). A lifting jack comprising a standard, a lifting member slidahly mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatably mounted on opposite sides of said standard and meshing with said actuating gear. a socket member pivotally connected to said standard and having two spring pressed locking dogs slidably mounted therein. said dogs having their outer ends beveled and being oppositely positioned so that they alternately and operatively engage the gears mounted on the sides of said standard to cause said actuating gear to rotate in one direction, a gear mounted on each dog. and an operating handle rotatably mounted in said socket and having a gear secured thereto which meshes with the gears on said dogs whereby said dogs may be given a half revolution by turning said handle thereby causing said actuating gear to rotate 'in the opposite direction. 10. A lifting jack comprising a standard, a lifting member slidably mounted therein, an actuating gear seated in said standard and having threaded engagement with said lifting member, gears rotatably mounted on 45 opposite sides of said standard and meshing with said actuating gear, a socket member pivotally connected to said standard and having two locking dogs siidably, mounted therein, said dogs having their outer ends 50 beveled and being oppositely positioned so that they alternately and operatively engage the gears mounted on the sides of said standard, a gear mounted on each dog, an operating handle rotatably mounted in said socket and having a gear secured thereto which meshes with the gears on said dogs whereby said dogs may be positioned by turning said handle so as to cause said actuating gear to rotate in one direction and reversed by turning said handle so as to cause said actuating gear to rot-ate in the other direction. and frictional meansto retain said handle in one or the other of said positions.

11. A lifting jack comprising'e standard, a lifting member movably guided thereby, mechanism for moving the member upward and downward, said mechanism including an actuating gear associated with the standard and having threaded engagement with said member. a gear mounted on said standard and meshing with said actuating gear, an operatin member pivoted to the stainlard and having a socket, a locking dog associated with said operating member and adapted to engage said second mentioned gear, a gear on said dog, a handle in said socket adapted to have relative movement therein, and a gear on said handle meshing with the gear on. said dog.

12. A lifting jack comprising a standard, a lifting member movably guided thereby, mechanism for moving the member upward anddownward. said mechanism including an actuating gear associated with the standard and having threaded engagement with said member, a gear mounted on said standard and meshing with said actuating gear, an operating member pivoted to the standard and having a socket,a bevel faced locking dog associated with said operating member and adapted to engage said second mentioned gear, a gear on said dog, a handle rotatably mounted in said socket, a gear on said handle meshing with the gear on said dog, whereby when said handle is in one position said lifting member is raised and when in another position it is lowered, and frictional means adapted to retain said handle in one or the other of said positions.

JOSEPH J. MIZER.

VICTOR JAKOB. 

